A quantized current source with mesoscopic feedback
Lukas Fricke, Frank Hohls, Niels Ubbelohde, Bernd Kaestner,, Vyacheslavs Kashcheyevs, Christoph Leicht, Philipp Mirovsky, Klaus Pierz,, Hans W. Schumacher, and Rolf J. Haug
TL;DR
This paper demonstrates a mesoscopic circuit with two quantized current sources where feedback via island charging locks the second pump's current to the first, revealing insights into quantum transport and excited state loading.
Contribution
It introduces a novel mesoscopic feedback mechanism that stabilizes current in a series of quantized electron pumps and detects excited state loading.
Findings
Quantum transport can be locked via island charging feedback.
Charge variation measurements confirm feedback mechanism.
Loading into excited states is evidenced during operation.
Abstract
We study a mesoscopic circuit of two quantized current sources, realized by non-adiabatic single- electron pumps connected in series with a small micron-sized island in between. We find that quantum transport through the second pump can be locked onto the quantized current of the first one by a feedback due to charging of the mesoscopic island. This is confirmed by a measurement of the charge variation on the island using a nearby charge detector. Finally, the charge feedback signal clearly evidences loading into excited states of the dynamic quantum dot during single-electron pump operation.
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